1 files changed, 701 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/psparse.c b/drivers/acpi/acpica/psparse.c
new file mode 100644
index 00000000000..70838e9b608
--- /dev/null
+++ b/drivers/acpi/acpica/psparse.c
@@ -0,0 +1,701 @@
+/******************************************************************************
+ *
+ * Module Name: psparse - Parser top level AML parse routines
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2008, Intel Corp.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    substantially similar to the "NO WARRANTY" disclaimer below
+ *    ("Disclaimer") and any redistribution must be conditioned upon
+ *    including a substantially similar Disclaimer requirement for further
+ *    binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ *    of any contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ */
+
+/*
+ * Parse the AML and build an operation tree as most interpreters,
+ * like Perl, do.  Parsing is done by hand rather than with a YACC
+ * generated parser to tightly constrain stack and dynamic memory
+ * usage.  At the same time, parsing is kept flexible and the code
+ * fairly compact by parsing based on a list of AML opcode
+ * templates in aml_op_info[]
+ */
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acparser.h"
+#include "acdispat.h"
+#include "amlcode.h"
+#include "acnamesp.h"
+#include "acinterp.h"
+
+#define _COMPONENT          ACPI_PARSER
+ACPI_MODULE_NAME("psparse")
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ps_get_opcode_size
+ *
+ * PARAMETERS:  Opcode          - An AML opcode
+ *
+ * RETURN:      Size of the opcode, in bytes (1 or 2)
+ *
+ * DESCRIPTION: Get the size of the current opcode.
+ *
+ ******************************************************************************/
+u32 acpi_ps_get_opcode_size(u32 opcode)
+{
+
+        /* Extended (2-byte) opcode if > 255 */
+
+        if (opcode > 0x00FF) {
+                return (2);
+        }
+
+        /* Otherwise, just a single byte opcode */
+
+        return (1);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ps_peek_opcode
+ *
+ * PARAMETERS:  parser_state        - A parser state object
+ *
+ * RETURN:      Next AML opcode
+ *
+ * DESCRIPTION: Get next AML opcode (without incrementing AML pointer)
+ *
+ ******************************************************************************/
+
+u16 acpi_ps_peek_opcode(struct acpi_parse_state * parser_state)
+{
+        u8 *aml;
+        u16 opcode;
+
+        aml = parser_state->aml;
+        opcode = (u16) ACPI_GET8(aml);
+
+        if (opcode == AML_EXTENDED_OP_PREFIX) {
+
+                /* Extended opcode, get the second opcode byte */
+
+                aml++;
+                opcode = (u16) ((opcode << 8) | ACPI_GET8(aml));
+        }
+
+        return (opcode);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ps_complete_this_op
+ *
+ * PARAMETERS:  walk_state      - Current State
+ *              Op              - Op to complete
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Perform any cleanup at the completion of an Op.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ps_complete_this_op(struct acpi_walk_state * walk_state,
+                         union acpi_parse_object * op)
+{
+        union acpi_parse_object *prev;
+        union acpi_parse_object *next;
+        const struct acpi_opcode_info *parent_info;
+        union acpi_parse_object *replacement_op = NULL;
+        acpi_status status = AE_OK;
+
+        ACPI_FUNCTION_TRACE_PTR(ps_complete_this_op, op);
+
+        /* Check for null Op, can happen if AML code is corrupt */
+
+        if (!op) {
+                return_ACPI_STATUS(AE_OK);      /* OK for now */
+        }
+
+        /* Delete this op and the subtree below it if asked to */
+
+        if (((walk_state->parse_flags & ACPI_PARSE_TREE_MASK) !=
+             ACPI_PARSE_DELETE_TREE)
+            || (walk_state->op_info->class == AML_CLASS_ARGUMENT)) {
+                return_ACPI_STATUS(AE_OK);
+        }
+
+        /* Make sure that we only delete this subtree */
+
+        if (op->common.parent) {
+                prev = op->common.parent->common.value.arg;
+                if (!prev) {
+
+                        /* Nothing more to do */
+
+                        goto cleanup;
+                }
+
+                /*
+                 * Check if we need to replace the operator and its subtree
+                 * with a return value op (placeholder op)
+                 */
+                parent_info =
+                    acpi_ps_get_opcode_info(op->common.parent->common.
+                                            aml_opcode);
+
+                switch (parent_info->class) {
+                case AML_CLASS_CONTROL:
+                        break;
+
+                case AML_CLASS_CREATE:
+
+                        /*
+                         * These opcodes contain term_arg operands. The current
+                         * op must be replaced by a placeholder return op
+                         */
+                        replacement_op =
+                            acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP);
+                        if (!replacement_op) {
+                                status = AE_NO_MEMORY;
+                        }
+                        break;
+
+                case AML_CLASS_NAMED_OBJECT:
+
+                        /*
+                         * These opcodes contain term_arg operands. The current
+                         * op must be replaced by a placeholder return op
+                         */
+                        if ((op->common.parent->common.aml_opcode ==
+                             AML_REGION_OP)
+                            || (op->common.parent->common.aml_opcode ==
+                                AML_DATA_REGION_OP)
+                            || (op->common.parent->common.aml_opcode ==
+                                AML_BUFFER_OP)
+                            || (op->common.parent->common.aml_opcode ==
+                                AML_PACKAGE_OP)
+                            || (op->common.parent->common.aml_opcode ==
+                                AML_BANK_FIELD_OP)
+                            || (op->common.parent->common.aml_opcode ==
+                                AML_VAR_PACKAGE_OP)) {
+                                replacement_op =
+                                    acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP);
+                                if (!replacement_op) {
+                                        status = AE_NO_MEMORY;
+                                }
+                        } else
+                            if ((op->common.parent->common.aml_opcode ==
+                                 AML_NAME_OP)
+                                && (walk_state->pass_number <=
+                                    ACPI_IMODE_LOAD_PASS2)) {
+                                if ((op->common.aml_opcode == AML_BUFFER_OP)
+                                    || (op->common.aml_opcode == AML_PACKAGE_OP)
+                                    || (op->common.aml_opcode ==
+                                        AML_VAR_PACKAGE_OP)) {
+                                        replacement_op =
+                                            acpi_ps_alloc_op(op->common.
+                                                             aml_opcode);
+                                        if (!replacement_op) {
+                                                status = AE_NO_MEMORY;
+                                        } else {
+                                                replacement_op->named.data =
+                                                    op->named.data;
+                                                replacement_op->named.length =
+                                                    op->named.length;
+                                        }
+                                }
+                        }
+                        break;
+
+                default:
+
+                        replacement_op =
+                            acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP);
+                        if (!replacement_op) {
+                                status = AE_NO_MEMORY;
+                        }
+                }
+
+                /* We must unlink this op from the parent tree */
+
+                if (prev == op) {
+
+                        /* This op is the first in the list */
+
+                        if (replacement_op) {
+                                replacement_op->common.parent =
+                                    op->common.parent;
+                                replacement_op->common.value.arg = NULL;
+                                replacement_op->common.node = op->common.node;
+                                op->common.parent->common.value.arg =
+                                    replacement_op;
+                                replacement_op->common.next = op->common.next;
+                        } else {
+                                op->common.parent->common.value.arg =
+                                    op->common.next;
+                        }
+                }
+
+                /* Search the parent list */
+
+                else
+                        while (prev) {
+
+                                /* Traverse all siblings in the parent's argument list */
+
+                                next = prev->common.next;
+                                if (next == op) {
+                                        if (replacement_op) {
+                                                replacement_op->common.parent =
+                                                    op->common.parent;
+                                                replacement_op->common.value.
+                                                    arg = NULL;
+                                                replacement_op->common.node =
+                                                    op->common.node;
+                                                prev->common.next =
+                                                    replacement_op;
+                                                replacement_op->common.next =
+                                                    op->common.next;
+                                                next = NULL;
+                                        } else {
+                                                prev->common.next =
+                                                    op->common.next;
+                                                next = NULL;
+                                        }
+                                }
+                                prev = next;
+                        }
+        }
+
+      cleanup:
+
+        /* Now we can actually delete the subtree rooted at Op */
+
+        acpi_ps_delete_parse_tree(op);
+        return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ps_next_parse_state
+ *
+ * PARAMETERS:  walk_state          - Current state
+ *              Op                  - Current parse op
+ *              callback_status     - Status from previous operation
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Update the parser state based upon the return exception from
+ *              the parser callback.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ps_next_parse_state(struct acpi_walk_state *walk_state,
+                         union acpi_parse_object *op,
+                         acpi_status callback_status)
+{
+        struct acpi_parse_state *parser_state = &walk_state->parser_state;
+        acpi_status status = AE_CTRL_PENDING;
+
+        ACPI_FUNCTION_TRACE_PTR(ps_next_parse_state, op);
+
+        switch (callback_status) {
+        case AE_CTRL_TERMINATE:
+                /*
+                 * A control method was terminated via a RETURN statement.
+                 * The walk of this method is complete.
+                 */
+                parser_state->aml = parser_state->aml_end;
+                status = AE_CTRL_TERMINATE;
+                break;
+
+        case AE_CTRL_BREAK:
+
+                parser_state->aml = walk_state->aml_last_while;
+                walk_state->control_state->common.value = FALSE;
+                status = AE_CTRL_BREAK;
+                break;
+
+        case AE_CTRL_CONTINUE:
+
+                parser_state->aml = walk_state->aml_last_while;
+                status = AE_CTRL_CONTINUE;
+                break;
+
+        case AE_CTRL_PENDING:
+
+                parser_state->aml = walk_state->aml_last_while;
+                break;
+
+#if 0
+        case AE_CTRL_SKIP:
+
+                parser_state->aml = parser_state->scope->parse_scope.pkg_end;
+                status = AE_OK;
+                break;
+#endif
+
+        case AE_CTRL_TRUE:
+                /*
+                 * Predicate of an IF was true, and we are at the matching ELSE.
+                 * Just close out this package
+                 */
+                parser_state->aml = acpi_ps_get_next_package_end(parser_state);
+                status = AE_CTRL_PENDING;
+                break;
+
+        case AE_CTRL_FALSE:
+                /*
+                 * Either an IF/WHILE Predicate was false or we encountered a BREAK
+                 * opcode.  In both cases, we do not execute the rest of the
+                 * package;  We simply close out the parent (finishing the walk of
+                 * this branch of the tree) and continue execution at the parent
+                 * level.
+                 */
+                parser_state->aml = parser_state->scope->parse_scope.pkg_end;
+
+                /* In the case of a BREAK, just force a predicate (if any) to FALSE */
+
+                walk_state->control_state->common.value = FALSE;
+                status = AE_CTRL_END;
+                break;
+
+        case AE_CTRL_TRANSFER:
+
+                /* A method call (invocation) -- transfer control */
+
+                status = AE_CTRL_TRANSFER;
+                walk_state->prev_op = op;
+                walk_state->method_call_op = op;
+                walk_state->method_call_node =
+                    (op->common.value.arg)->common.node;
+
+                /* Will return value (if any) be used by the caller? */
+
+                walk_state->return_used =
+                    acpi_ds_is_result_used(op, walk_state);
+                break;
+
+        default:
+
+                status = callback_status;
+                if ((callback_status & AE_CODE_MASK) == AE_CODE_CONTROL) {
+                        status = AE_OK;
+                }
+                break;
+        }
+
+        return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ps_parse_aml
+ *
+ * PARAMETERS:  walk_state      - Current state
+ *
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Parse raw AML and return a tree of ops
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ps_parse_aml(struct acpi_walk_state *walk_state)
+{
+        acpi_status status;
+        struct acpi_thread_state *thread;
+        struct acpi_thread_state *prev_walk_list = acpi_gbl_current_walk_list;
+        struct acpi_walk_state *previous_walk_state;
+
+        ACPI_FUNCTION_TRACE(ps_parse_aml);
+
+        ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
+                          "Entered with WalkState=%p Aml=%p size=%X\n",
+                          walk_state, walk_state->parser_state.aml,
+                          walk_state->parser_state.aml_size));
+
+        if (!walk_state->parser_state.aml) {
+                return_ACPI_STATUS(AE_NULL_OBJECT);
+        }
+
+        /* Create and initialize a new thread state */
+
+        thread = acpi_ut_create_thread_state();
+        if (!thread) {
+                if (walk_state->method_desc) {
+
+                        /* Executing a control method - additional cleanup */
+
+                        acpi_ds_terminate_control_method(
+                                walk_state->method_desc, walk_state);
+                }
+
+                acpi_ds_delete_walk_state(walk_state);
+                return_ACPI_STATUS(AE_NO_MEMORY);
+        }
+
+        walk_state->thread = thread;
+
+        /*
+         * If executing a method, the starting sync_level is this method's
+         * sync_level
+         */
+        if (walk_state->method_desc) {
+                walk_state->thread->current_sync_level =
+                    walk_state->method_desc->method.sync_level;
+        }
+
+        acpi_ds_push_walk_state(walk_state, thread);
+
+        /*
+         * This global allows the AML debugger to get a handle to the currently
+         * executing control method.
+         */
+        acpi_gbl_current_walk_list = thread;
+
+        /*
+         * Execute the walk loop as long as there is a valid Walk State.  This
+         * handles nested control method invocations without recursion.
+         */
+        ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "State=%p\n", walk_state));
+
+        status = AE_OK;
+        while (walk_state) {
+                if (ACPI_SUCCESS(status)) {
+                        /*
+                         * The parse_loop executes AML until the method terminates
+                         * or calls another method.
+                         */
+                        status = acpi_ps_parse_loop(walk_state);
+                }
+
+                ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
+                                  "Completed one call to walk loop, %s State=%p\n",
+                                  acpi_format_exception(status), walk_state));
+
+                if (status == AE_CTRL_TRANSFER) {
+                        /*
+                         * A method call was detected.
+                         * Transfer control to the called control method
+                         */
+                        status =
+                            acpi_ds_call_control_method(thread, walk_state,
+                                                        NULL);
+                        if (ACPI_FAILURE(status)) {
+                                status =
+                                    acpi_ds_method_error(status, walk_state);
+                        }
+
+                        /*
+                         * If the transfer to the new method method call worked, a new walk
+                         * state was created -- get it
+                         */
+                        walk_state = acpi_ds_get_current_walk_state(thread);
+                        continue;
+                } else if (status == AE_CTRL_TERMINATE) {
+                        status = AE_OK;
+                } else if ((status != AE_OK) && (walk_state->method_desc)) {
+
+                        /* Either the method parse or actual execution failed */
+
+                        ACPI_ERROR_METHOD("Method parse/execution failed",
+                                          walk_state->method_node, NULL,
+                                          status);
+
+                        /* Check for possible multi-thread reentrancy problem */
+
+                        if ((status == AE_ALREADY_EXISTS) &&
+                            (!walk_state->method_desc->method.mutex)) {
+                                ACPI_INFO((AE_INFO,
+                                           "Marking method %4.4s as Serialized because of AE_ALREADY_EXISTS error",
+                                           walk_state->method_node->name.
+                                           ascii));
+
+                                /*
+                                 * Method tried to create an object twice. The probable cause is
+                                 * that the method cannot handle reentrancy.
+                                 *
+                                 * The method is marked not_serialized, but it tried to create
+                                 * a named object, causing the second thread entrance to fail.
+                                 * Workaround this problem by marking the method permanently
+                                 * as Serialized.
+                                 */
+                                walk_state->method_desc->method.method_flags |=
+                                    AML_METHOD_SERIALIZED;
+                                walk_state->method_desc->method.sync_level = 0;
+                        }
+                }
+
+                /* We are done with this walk, move on to the parent if any */
+
+                walk_state = acpi_ds_pop_walk_state(thread);
+
+                /* Reset the current scope to the beginning of scope stack */
+
+                acpi_ds_scope_stack_clear(walk_state);
+
+                /*
+                 * If we just returned from the execution of a control method or if we
+                 * encountered an error during the method parse phase, there's lots of
+                 * cleanup to do
+                 */
+                if (((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) ==
+                     ACPI_PARSE_EXECUTE) || (ACPI_FAILURE(status))) {
+                        acpi_ds_terminate_control_method(walk_state->
+                                                         method_desc,
+                                                         walk_state);
+                }
+
+                /* Delete this walk state and all linked control states */
+
+                acpi_ps_cleanup_scope(&walk_state->parser_state);
+                previous_walk_state = walk_state;
+
+                ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
+                                  "ReturnValue=%p, ImplicitValue=%p State=%p\n",
+                                  walk_state->return_desc,
+                                  walk_state->implicit_return_obj, walk_state));
+
+                /* Check if we have restarted a preempted walk */
+
+                walk_state = acpi_ds_get_current_walk_state(thread);
+                if (walk_state) {
+                        if (ACPI_SUCCESS(status)) {
+                                /*
+                                 * There is another walk state, restart it.
+                                 * If the method return value is not used by the parent,
+                                 * The object is deleted
+                                 */
+                                if (!previous_walk_state->return_desc) {
+                                        /*
+                                         * In slack mode execution, if there is no return value
+                                         * we should implicitly return zero (0) as a default value.
+                                         */
+                                        if (acpi_gbl_enable_interpreter_slack &&
+                                            !previous_walk_state->
+                                            implicit_return_obj) {
+                                                previous_walk_state->
+                                                    implicit_return_obj =
+                                                    acpi_ut_create_internal_object
+                                                    (ACPI_TYPE_INTEGER);
+                                                if (!previous_walk_state->
+                                                    implicit_return_obj) {
+                                                        return_ACPI_STATUS
+                                                            (AE_NO_MEMORY);
+                                                }
+
+                                                previous_walk_state->
+                                                    implicit_return_obj->
+                                                    integer.value = 0;
+                                        }
+
+                                        /* Restart the calling control method */
+
+                                        status =
+                                            acpi_ds_restart_control_method
+                                            (walk_state,
+                                             previous_walk_state->
+                                             implicit_return_obj);
+                                } else {
+                                        /*
+                                         * We have a valid return value, delete any implicit
+                                         * return value.
+                                         */
+                                        acpi_ds_clear_implicit_return
+                                            (previous_walk_state);
+
+                                        status =
+                                            acpi_ds_restart_control_method
+                                            (walk_state,
+                                             previous_walk_state->return_desc);
+                                }
+                                if (ACPI_SUCCESS(status)) {
+                                        walk_state->walk_type |=
+                                            ACPI_WALK_METHOD_RESTART;
+                                }
+                        } else {
+                                /* On error, delete any return object or implicit return */
+
+                                acpi_ut_remove_reference(previous_walk_state->
+                                                         return_desc);
+                                acpi_ds_clear_implicit_return
+                                    (previous_walk_state);
+                        }
+                }
+
+                /*
+                 * Just completed a 1st-level method, save the final internal return
+                 * value (if any)
+                 */
+                else if (previous_walk_state->caller_return_desc) {
+                        if (previous_walk_state->implicit_return_obj) {
+                                *(previous_walk_state->caller_return_desc) =
+                                    previous_walk_state->implicit_return_obj;
+                        } else {
+                                /* NULL if no return value */
+
+                                *(previous_walk_state->caller_return_desc) =
+                                    previous_walk_state->return_desc;
+                        }
+                } else {
+                        if (previous_walk_state->return_desc) {
+
+                                /* Caller doesn't want it, must delete it */
+
+                                acpi_ut_remove_reference(previous_walk_state->
+                                                         return_desc);
+                        }
+                        if (previous_walk_state->implicit_return_obj) {
+
+                                /* Caller doesn't want it, must delete it */
+
+                                acpi_ut_remove_reference(previous_walk_state->
+                                                         implicit_return_obj);
+                        }
+                }
+
+                acpi_ds_delete_walk_state(previous_walk_state);
+        }
+
+        /* Normal exit */
+
+        acpi_ex_release_all_mutexes(thread);
+        acpi_ut_delete_generic_state(ACPI_CAST_PTR
+                                     (union acpi_generic_state, thread));
+        acpi_gbl_current_walk_list = prev_walk_list;
+        return_ACPI_STATUS(status);
+}